For a shared building, as used by college/university students (not a share room for multiple occupants as implied by the term in British English). Alternatively, use building=residential plus residential=university.

Other Buildings

A building used as a bridge. Can also represent a gatehouse for drawbridges. See also bridge=yes for highway=*. Don't use this tag just for marking bridges (their outlines). For such purposes use man_made=bridge.

A transformer tower is a characteristic tall building comprising a distribution transformer and constructed to connect directly to a medium voltage overhead power line. Quite often the power line has since been undergrounded but the building may still serve as a substation. If the building is still in use as a substation it should additionally be tagged as power=substation + substation=minor_distribution.